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Cheap flights from London to Southeast Asia from €351

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Southeast Asia departing on 6/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London to Southeast Asia

Cheap return flights

Gulf Air Logo
11:25 - 12:20LGW-SIN
17h 55m1 stop
Gulf Air Logo
20:00 - 06:55SIN-LGW
17h 55m1 stop
€555Gulf Air
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Wed, 24 Sep - Thu, 2 Oct
Gulf Air Logo
10:35 - 12:30LGW-SIN
17h 55m1 stop
Gulf Air Logo
20:25 - 06:30SIN-LGW
18h 05m1 stop
€556Gulf Air
Find Deal
Sun, 25 Jan - Tue, 17 Feb
Logo
21:50 - 17:20LGW-SIN
36h 30m2 stops
Logo
01:40 - 15:50SIN-LGW
21h 10m1 stop
€564
Find Deal
Mon, 6 Oct - Sun, 19 Oct
Oman Air Logo
20:05 - 06:45LHR-BKK
27h 40m1 stop
Oman Air Logo
20:05 - 18:25BKK-LHR
29h 20m1 stop
€566Oman Air
Find Deal
Sun, 8 Feb - Mon, 23 Feb
Austrian Airlines Logo
10:25 - 14:50LHR-BKK
22h 25m1 stop
Austrian Airlines Logo
23:40 - 08:20BKK-LHR
14h 40m1 stop
€568Austrian Airlines
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Tue, 2 Sep - Thu, 11 Sep
Logo
09:00 - 17:45LGW-SIN
25h 45m2 stops
Logo
01:40 - 15:50SIN-LGW
21h 10m1 stop
€572
Find Deal
Mon, 6 Oct - Sun, 19 Oct
Austrian Airlines Logo
13:55 - 12:20LHR-BKK
15h 25m1 stop
Austrian Airlines Logo
14:00 - 21:40BKK-LHR
14h 40m1 stop
€577Austrian Airlines
Find Deal
Sun, 7 Dec - Mon, 26 Jan
Oman Air Logo
20:50 - 17:45LHR-BKK
14h 55m1 stop
Oman Air Logo
09:00 - 19:10BKK-LHR
16h 10m1 stop
€590Oman Air
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Mon, 6 Oct - Mon, 13 Oct
Air China Logo
20:25 - 00:05LHR-BKK
21h 40m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€614Air China
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Fri, 12 Sep - Tue, 28 Oct
Air China Logo
22:40 - 17:05LHR-BKK
36h 25m2 stops
Air China Logo
19:30 - 15:55BKK-LHR
27h 25m1 stop
€623Air China
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Sun, 7 Sep - Wed, 29 Oct

SAUDIA flights from London to Southeast Asia

Our best SAUDIA deals on London to Southeast Asia flight tickets
SAUDIA
1 Sept
LHR10:00London Heathrow
21h 45m
1 stop
BKK13:45Bangkok Suvarnabhumi
19 Sept
BKK01:50Bangkok Suvarnabhumi
24h 40m
1 stop
LHR20:30London Heathrow
€609
Find similar
SAUDIA
2 Nov
LHR22:05London Heathrow
18h 25m
1 stop
BKK23:30Bangkok Suvarnabhumi
1 Dec
BKK01:15Bangkok Suvarnabhumi
18h 00m
1 stop
LHR12:15London Heathrow
€609
Find similar
SAUDIA
3 Dec
LHR10:00London Heathrow
20h 40m
1 stop
BKK13:40Bangkok Suvarnabhumi
7 Feb
BKK15:20Bangkok Suvarnabhumi
23h 10m
1 stop
LHR07:30London Heathrow
€616
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Oman Air flights from London to Southeast Asia

Our best Oman Air deals on London to Southeast Asia flight tickets
Oman Air
8 Feb
LHR20:05London Heathrow
27h 40m
1 stop
BKK06:45Bangkok Suvarnabhumi
23 Feb
BKK20:05Bangkok Suvarnabhumi
29h 20m
1 stop
LHR18:25London Heathrow
€566
Find similar
Oman Air
6 Oct
LHR20:50London Heathrow
14h 55m
1 stop
BKK17:45Bangkok Suvarnabhumi
13 Oct
BKK09:00Bangkok Suvarnabhumi
16h 10m
1 stop
LHR19:10London Heathrow
€590
Find similar
Oman Air
17 Jan
LHR20:05London Heathrow
27h 40m
1 stop
BKK06:45Bangkok Suvarnabhumi
1 Feb
BKK20:05Bangkok Suvarnabhumi
16h 50m
1 stop
LHR05:55London Heathrow
€592
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London to Southeast Asia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 13,528 searches. Data last updated 23 August 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Wed 24/9

11:25-12:20

1 stop17h 55m

Singapore Changi

Thu 2/10

20:00-06:55

1 stop17h 55m

€555

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 25/1

10:35-12:30

1 stop17h 55m

Singapore Changi

Tue 17/2

20:25-06:30

1 stop18h 05m

€556

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Mon 6/10

21:50-17:20

2 stops36h 30m

Singapore Changi

Sun 19/10

01:40-15:50

1 stop21h 10m

€564

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 8/2

20:05-06:45

1 stop27h 40m

Bangkok Suvarnabhumi

Mon 23/2

20:05-18:25

1 stop29h 20m

€566

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 2/9

10:25-14:50

1 stop22h 25m

Bangkok Suvarnabhumi

Thu 11/9

23:40-08:20

1 stop14h 40m

€568

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Mon 6/10

09:00-17:45

2 stops25h 45m

Singapore Changi

Sun 19/10

01:40-15:50

1 stop21h 10m

€572

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 7/12

13:55-12:20

1 stop15h 25m

Bangkok Suvarnabhumi

Mon 26/1

14:00-21:40

1 stop14h 40m

€577

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 6/10

20:50-17:45

1 stop14h 55m

Bangkok Suvarnabhumi

Mon 13/10

09:00-19:10

1 stop16h 10m

€590

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 12/9

20:25-00:05

1 stop21h 40m

Bangkok Suvarnabhumi

Tue 28/10

01:30-15:55

1 stop21h 25m

€614

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 7/9

22:40-17:05

2 stops36h 25m

Bangkok Suvarnabhumi

Wed 29/10

19:30-15:55

1 stop27h 25m

€623

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Southeast Asia from

How to get the cheapest flight ticket from London to Southeast Asia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Southeast Asia?

The cheapest month to fly to Southeast Asia from London is in May. Flight prices, which tend to average around €466, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in May, then September is your next best option. Flight prices from London to Southeast Asia during September average around €633.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from London to Southeast Asia is on a Wednesday. Travellers who choose to depart for Southeast Asia on a Wednesday will often find tickets for as low as €788. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,161. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

Our most recent data shows that the best time of day to fly to Southeast Asia is in the afternoon. Flights from London to Southeast Asia during this time can be as low as €683. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €920. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Southeast Asia flight route?

Fly from London Gatwick to Singapore Changi for the best London - Southeast Asia flight prices

How far in advance should I book a flight to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around €811 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London for as low as €750 on momondo.

What cabin class options are available on London to Southeast Asia flights?

There are 2 cabin classes available to choose from on London to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London to Southeast Asia.

Cheap London to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Southeast Asia

Fastest flight time

11h 25m

Direct flights

Every day

Airports in Southeast Asia

1 airport
The fastest flight from London to Southeast Asia takes 11h 25m
Direct flights go from London to Southeast Asia every day.
There is 1 airport near Southeast Asia: Bangkok Suvarnabhumi (BKK)
Search flight deals

  • When did momondo last update prices for flights from London to Southeast Asia?

    Prices for flights from London to Southeast Asia refresh daily.

  • How old do you have to be to fly from London to Southeast Asia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The travel and health documents you'll need for your trip to Southeast Asia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Southeast Asia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Southeast Asia?

Best airlines flying from London to Southeast Asia

Compare and see reviews for airlines that fly from London to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
Air ChinaPriceFrom €465Free CancellationRating
7.3
95 reviews
Search Air China flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Southeast Asia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Southeast Asia . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Southeast Asia with flexible booking policies on momondo?

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Southeast Asia?

momondo provides multiple filters to help you find the best flight to Southeast Asia from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Southeast Asia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Southeast Asia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Southeast Asia trip

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